Here is a rigged animation I did to match music I wrote on my guitar. The key to syncing the music file
with the Blender animation was to create a “foot tap” cycle across 1 second in blender. Then adjust the speed of this tapping cycle to match the actual beat of the music (music was a steady 116bpm or 1.93 beats per second)…so 1.93 was the ratio I worked with in getting correct speed in Blender VSE.
Bit of a learning curve as Im a Newbie but happy with outcome.